C/Development/Timer — различия между версиями
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Admin (обсуждение | вклад) м (1 версия: Импорт контента...) |
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Текущая версия на 10:22, 25 мая 2010
Display a software timer
#include <stdio.h>
#define DELAY 128000
struct my_time {
int hours;
int minutes;
int seconds;
} ;
int main(void)
{
struct my_time systime;
if(systime.seconds==60) {
systime.seconds = 0;
systime.minutes++;
}
if(systime.minutes==60) {
systime.minutes = 0;
systime.hours++;
}
if(systime.hours==24)
systime.hours = 0;
printf("\n%02d:", systime.hours);
printf("\n%02d:", systime.minutes);
printf("\n%02d\n", systime.seconds);
return 0;
}
Test our timer function
/*
Beginning C, Third Edition
By Ivor Horton
ISBN: 1-59059-253-0
Published: Apr 2004
Publisher: apress
*/
#include <stdio.h>
#include <time.h>
void main()
{
long count = 100000000; /* Number of loop iterations */
long i = 0; /* Loop counter */
time_t calendar = 0; /* Holds calendar time */
clock_t now = 0; /* Holds initial clock time */
int interval = 3; /* Seconds interval for o/p */
int elapsed = 0; /* Elapsed clock time secs. */
calendar = time(NULL); /* Get current calendar time */
now = clock(); /* Get current clock time */
printf("Initial clock time = %d Initial calendar time = %d\n",
now, calendar);
for(i = 0L ; i<count ; i++)
{
elapsed = (clock()-now)/CLOCKS_PER_SEC;
if(elapsed>=interval)
{
interval += 3;
printf("\nElapsed = %ld seconds iterations = %ld", elapsed, i);
}
}
printf("\nCPU time for %ld interations is %.2lf seconds\n",
count, (double)(clock()-now)/CLOCKS_PER_SEC );
printf("\Final clock time = %d Final calendar time = %d\n",
clock(), time(NULL));
printf("\nElapsed calendar time to execute the program is %lf\n",
difftime(time(NULL), calendar));
}